Chances are that sometime this week your phone will die, leaving you powerless at the most inopportune time. A backup battery is pretty much necessary at this point, unless you’re able to find a wall outlet on the interstate. Enter the Bolt Portable Battery ($50). Its a backup battery and a USB wall charger in one compact design with enough juice storage to completely charge your iPhone or Android smartphone twice on the go. Includes battery indicator LED lights and a rubberized finish available in Stealth, Graphite, or another color of your choice.